Encyclopaedia
Ulrey's tetra
Hemigrammus ulreyi
A discreet, refined tetra with a broken black line running along the flank, interrupted by a luminous spot at the caudal peduncle. Less flashy than more famous cousins but with a subtle charm appreciated in well-set-up biotope tanks with dark, tannic water. Breeding considered challenging compared to other tetras — eggs and fry are extremely light-sensitive and must be kept in darkness. Ideal for hobbyists seeking a less common tetra to enrich a South American biotope.
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22 - 27 °C
6 - 7.5
Freshwater
Middle
4.5 cm
>= 70 L
>= 6
2 - 12 dGH
1 - 6 dKH
40 - 240 ppm
63 - 375 uS/cm
Species description
Care, breeding and tankmates
Geographic Origin and Distribution
Origin
Fish profile
- Temperament
- Peaceful
- Diet
- Omnivore
- Sex ratio
- School
- Feeding frequency
- Twice daily
- Bioload
- Low
- Flow
- Strong
- Jump risk
- No
- Reproduction
- Oviparous
- Compatibility & tankmates
- Peaceful
- Tank level
- Middle
Window to the official scientific data of the species
Scientific Parameters & Models
- Trophic level
- 3.2 ± 0.4 se
- Resilience
- High (less than 15 months)
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.01995, b = 2.97
Image gallery
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Related species
Recommendations grouped by close relatives, companion choices, and similar care.
Variants and close relatives
Same atlas type, nearby scientific identity, genus, or family.
Recommended companions
Compatible cards from coherent ecosystems with matching parameters.
Similar care
Cards with similar requirements, difficulty, habitat, and husbandry profile.















































